<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>列表过滤</title>
    <script type="text/javascript" src="../js/vue.js"></script>
</head>

<body>
    <div id="root">
        <h2>人员列表</h2>
        <input type="text" placeholder="请输入名字" v-model="keyWord" />
        <ul>
            <li v-for="(p,index) in filterPersons">
                {{p.name}}-{{p.age}}-{{p.sex}}
            </li>
        </ul>


    </div>
</body>
<script type="text/javascript">
    //<!-- 基于watch 实现 列表过滤 -->
    // 当监视的属性发生变化时,执行watch动作,immediate 初始化执行一次 -->

    /** 
    new Vue({
            el: '#root',
    
            data: {
                keyWord: '',
                persons: [
                    { id: "001", "name": "马冬梅", "age": 18, 'sex': '女' },
                    { id: "002", "name": "周冬梅", "age": 19, 'sex': '女' },
                    { id: "003", "name": "周杰伦", "age": 20, 'sex': '男' },
                    { id: "004", "name": "刘杰华", "age": 21, 'sex': '男' }
                ],
                filterPersons: []
            },
            watch: {
                keyWord: {
                    immediate: true,
                    handler(val) {
                        console.log('没执行')
                        this.filterPersons = this.persons.filter((p) => {
                            return p.name.indexOf(val) !== -1
                        })
                    }
                }
            }
        })
        */

    //基于计算属性实现 

    new Vue({
        el: '#root',
        data: {
            keyWord: '',
            persons: [
                { id: "001", "name": "马冬梅", "age": 18, 'sex': '女' },
                { id: "002", "name": "周冬梅", "age": 19, 'sex': '女' },
                { id: "003", "name": "周杰伦", "age": 20, 'sex': '男' },
                { id: "004", "name": "刘杰华", "age": 21, 'sex': '男' }
            ],
        },
        computed: {
            filterPersons(){
                return this.persons.filter((p)=>{
                    return p.name.indexOf(this.keyWord) !==-1
                })
            } 
        },
    })
</script>

</html>